package com.velocity.utils;

import com.velocity.config.GenConfig;
import com.velocity.entity.ColumnEntity;
import com.velocity.entity.TableEntity;
import org.apache.commons.configuration.Configuration;
import org.apache.commons.configuration.ConfigurationException;
import org.apache.commons.configuration.PropertiesConfiguration;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang.StringUtils;
import org.apache.commons.lang.WordUtils;
import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.Velocity;

import java.io.File;
import java.io.IOException;
import java.io.StringWriter;
import java.text.SimpleDateFormat;
import java.util.*;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

/**
 * @author lijingyang
 * @Title:
 * @Package
 * @Description:
 * @date 2021/7/28 19:03
 */
public class GenUtils {
    private static final String VM_JAVACLASS_DEFAULT = "templates/vm/java/default/";

    public static List<String> getTemplates() {
        List<String> templates = getMybatisTemplates();
        if (!GenConfig.defaultVal) {
            templates = getJPATemplates();
        }
        return templates;
    }

    /**
     * @Param
     * @Description: 生成mybatis文件配置
     * @Author: lijingyang
     * @Date: 2021/8/3 15:09
     * @Return java.util.List<java.lang.String>
     **/
    private static List<String> getMybatisTemplates() {
        String path = VM_JAVACLASS_DEFAULT;
        List<String> templates = new ArrayList<String>();
        templates.add(path + "Entity.java.vm");
        templates.add(path + "DAO.java.vm");
        templates.add(path + "DAO.xml.vm");
        templates.add(path + "Service.java.vm");
        templates.add(path + "ServiceImpl.java.vm");
        templates.add(path + "Controller.java.vm");
        return templates;
    }
    /**
     * @Param
     * @Description: 生成jpa文件配置
     * @Author: lijingyang
     * @Date: 2021/8/3 15:09
     * @Return java.util.List<java.lang.String>
     **/
    private static List<String> getJPATemplates() {

        String path = GenConfig.modulePath;
        List<String> templates = new ArrayList<String>();
        templates.add(path + "Entity.java.vm");
        templates.add(path + "DAO.java.vm");
        templates.add(path + "Service.java.vm");
        templates.add(path + "Controller.java.vm");
        return templates;
    }

    /**
     * 生成代码
     */
    public static void generatorCode(Map<String, String> table, List<Map<String, String>> columns, ZipOutputStream zip) {
        //配置信息
        Configuration config = getConfig();
        boolean hasBigDecimal = false;
        //表信息
        TableEntity tableEntity = new TableEntity();
        tableEntity.setTableName(table.get("tableName"));
        tableEntity.setComments(table.get("tableComment"));
        //表名转换成Java类名
        String className = tableToJava(tableEntity.getTableName(), config.getString("tablePrefix"));
        tableEntity.setUpperFirstName(className);
        tableEntity.setLowerFirstName(StringUtils.uncapitalize(className));

        //列信息
        List<ColumnEntity> columsList = new ArrayList<ColumnEntity>();
        String[] ignoreFields = config.getStringArray("ignoreField");
        for (Map<String, String> column : columns) {
            if (!Arrays.asList(ignoreFields).contains(column.get("columnName"))) {
                ColumnEntity columnEntity = new ColumnEntity();
                columnEntity.setColumnName(column.get("columnName"));
                columnEntity.setDataType(column.get("dataType"));
                columnEntity.setComments(column.get("columnComment"));
                columnEntity.setExtra(column.get("extra"));

                //列名转换成Java属性名
                String attrName = columnToJava(columnEntity.getColumnName());
                columnEntity.setUpperAttrName(attrName);
                columnEntity.setLowerAttrName(StringUtils.uncapitalize(attrName));

                //列的数据类型，转换成Java类型
                String attrType = config.getString(columnEntity.getDataType(), "unknowType");
                columnEntity.setAttrType(attrType);
                if (!hasBigDecimal && attrType.equals("BigDecimal")) {
                    hasBigDecimal = true;
                }
                //是否主键
                if ("PRI".equalsIgnoreCase(column.get("columnKey")) && tableEntity.getPk() == null) {
                    tableEntity.setPk(columnEntity);
                }

                columsList.add(columnEntity);
            }

        }
        tableEntity.setColumns(columsList);

        //没主键，则第一个字段为主键
        if (tableEntity.getPk() == null) {
            tableEntity.setPk(tableEntity.getColumns().get(0));
        }

        //设置velocity资源加载器
        Properties prop = new Properties();
        prop.put("file.resource.loader.class", "org.apache.velocity.runtime.resource.loader.ClasspathResourceLoader");
        Velocity.init(prop);
        String mainPath = config.getString("mainPath");
        mainPath = StringUtils.isBlank(mainPath) ? "com.suke.czx" : mainPath;
        //封装模板数据
        Map<String, Object> map = new HashMap<String, Object>();
        map.put("tableName", tableEntity.getTableName());
        map.put("comments", tableEntity.getComments());
        map.put("pk", tableEntity.getPk());
        map.put("className", tableEntity.getUpperFirstName());
        map.put("classname", tableEntity.getLowerFirstName());
        map.put("pathName", tableEntity.getLowerFirstName().toLowerCase());
        map.put("columns", tableEntity.getColumns());
        map.put("hasBigDecimal", hasBigDecimal);
        map.put("mainPath", mainPath);
        map.put("package", config.getString("package"));
        map.put("moduleName", config.getString("moduleName"));
        map.put("author", config.getString("author"));
        map.put("email", config.getString("email"));
        map.put("datetime", new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date()));
        VelocityContext context = new VelocityContext(map);

        //获取模板列表
        List<String> templates = getTemplates();
        for (String template : templates) {
            //渲染模板
            StringWriter sw = new StringWriter();
            Template tpl = Velocity.getTemplate(template, "UTF-8");
            tpl.merge(context, sw);

            try {
                //添加到zip
                zip.putNextEntry(new ZipEntry(getFileName(template, tableEntity.getUpperFirstName(), config.getString("package"), config.getString("moduleName"))));
                IOUtils.write(sw.toString(), zip, "UTF-8");
                IOUtils.closeQuietly(sw);
                zip.closeEntry();
            } catch (IOException e) {
                throw new RuntimeException("渲染模板失败，表名：" + tableEntity.getTableName(), e);
            }
        }
    }


    /**
     * 列名转换成Java属性名
     */
    public static String columnToJava(String columnName) {
        return WordUtils.capitalizeFully(columnName, new char[]{'_'}).replace("_", "");
    }

    /**
     * 表名转换成Java类名
     */
    public static String tableToJava(String tableName, String tablePrefix) {
        if (StringUtils.isNotBlank(tablePrefix)) {
            tableName = tableName.replace(tablePrefix, "");
        }
        return columnToJava(tableName);
    }

    /**
     * 获取配置信息
     */
    public static Configuration getConfig() {
        try {
            return new PropertiesConfiguration("generator.yml");
        } catch (ConfigurationException e) {
            throw new RuntimeException("获取配置文件失败，", e);
        }
    }

    /**
     * 获取文件名
     */
    public static String getFileName(String template, String className, String packageName, String moduleName) {
        String packagePath = "main" + File.separator + "java" + File.separator;
        if (StringUtils.isNotBlank(packageName)) {
            packagePath += packageName.replace(".", File.separator) + File.separator + moduleName + File.separator;
        }

        if (template.contains("Entity.java.vm")) {
            return packagePath + "entity" + File.separator + className + "Entity.java";
        }

        if (template.contains("DAO.java.vm")) {
            return packagePath + "dao" + File.separator + className + "DAO.java";
        }

        if (template.contains("Service.java.vm")) {
            return packagePath + "service" + File.separator + className + "Service.java";
        }

        if (template.contains("ServiceImpl.java.vm")) {
            return packagePath + "service" + File.separator + "impl" + File.separator + className + "ServiceImpl.java";
        }

        if (template.contains("Controller.java.vm")) {
            return packagePath + "controller" + File.separator + className + "Controller.java";
        }

        if (template.contains("DAO.xml.vm")) {
            return "main" + File.separator + "resources" + File.separator + "dao" + File.separator + moduleName + File.separator + className + "DAO.xml";
        }

        if (template.contains("list.html.vm")) {
            return "main" + File.separator + "resources" + File.separator + "views" + File.separator
                    + "modules" + File.separator + moduleName + File.separator + className.toLowerCase() + ".html";
        }

        if (template.contains("list.js.vm")) {
            return "main" + File.separator + "resources" + File.separator + "static" + File.separator + "js" + File.separator
                    + "modules" + File.separator + moduleName + File.separator + className.toLowerCase() + ".js";
        }

        if (template.contains("menu.sql.vm")) {
            return className.toLowerCase() + "_menu.sql";
        }

        return null;
    }
}